I'm told not to speculate, but I'm going to do it anyway because this video clearly shows there was an issue going to full thrust. It's an extremely rare dual engine failure or pilots' error not calling up full thrust to keep it flying. Very possible this is the famous bird strike issue Capt. Sullenburger experienced in 2009.
But doesn't seem like a bird strike issue here, right? And given the rarity of a dual engine failure, seems to point to not calling up full thrust? But seems to me that this kind of error would be more common without any technical safeguards?